From patchwork Fri Oct 2 16:20:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kalesh Singh X-Patchwork-Id: 11813971 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A3491112C for ; Fri, 2 Oct 2020 16:22:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8938D2085B for ; Fri, 2 Oct 2020 16:22:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Z2BhCB0i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388169AbgJBQWi (ORCPT ); Fri, 2 Oct 2020 12:22:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43798 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388076AbgJBQWh (ORCPT ); Fri, 2 Oct 2020 12:22:37 -0400 Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75B67C0613E2 for ; Fri, 2 Oct 2020 09:22:37 -0700 (PDT) Received: by mail-qt1-x849.google.com with SMTP id g44so1386623qtb.15 for ; Fri, 02 Oct 2020 09:22:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:cc; bh=bMnBZVJZ0gP6yWIahq+ggDCPy47CsnYvJiYw0n333nM=; b=Z2BhCB0ionBjY9f7rJg975U+QnCTCPpylLVtNijw2nkc9jOX0nWeWzaScP/MiSCHxb VlNw+IBd6+iMm5/zsKLjJhp4Av/TRf3MlDYx51iPzzIF3DYfrx3bJCSrtH9C//COkKxc xSYhR8fO9b21qmYKgflHjxUWg6wu/GpUAhEGJPmZeDcdY7rbfDAfRXb8euzLbp12Zh88 edKzBO0V9SHioyYGqGPIsn7hVLnsZnoCKmyX8mkVd22fnpHi1uxrWXuN4V+FYJ+VfUUh jHc4fZgacTCxZJu3LoVwWYVB64D6hIAt2jp6nQ4THkRgwkXaDAkjk/QHsk/CbqUR/Y1b Hr2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:cc; bh=bMnBZVJZ0gP6yWIahq+ggDCPy47CsnYvJiYw0n333nM=; b=hlD8wg4EtCw+pwZgVUghbcRNzAc7YCqw1G7OVOWJjCCl3WbAWSKgctbgCn44TWdEAX qzWa7Y3bqaK0tOV7WsP267integQrmIVcXp0iqtoOWITKHRJxBKuR+cWrINsvKzZaKJV H4hDbKmh3gu943BqJY5pwEiCOzCtP/FPHBMyacMWFN7a1goiBogEX6aKkIJvHRKikFKV vR3AoRi29rEwacPqKhiCExUQ2RA/czA5VNXt8Mnvr8GcfIVOJyKW4NA7XIKbkyUqrDee nY3vMAp55uIzXr+ZzCmEndNEOKdwWm13W3HIVShyJQrGzlv3ot0Hf5WZTNEqv69HvFaT PjmQ== X-Gm-Message-State: AOAM533vqtoyGJFs8En/MnVuAzHcEuPixm34KxN/kXqHFv1AHOZwn3Gx EUbce1XvtFHDl/GIYkVy+LrQgXkPUZ05kfH3HA== X-Google-Smtp-Source: ABdhPJwWzjZJWRiWHzB7SAUtAP2b0hza2Y8k4Vz+cdfMrWfqG4bkLxAOeDCVeFU+z7OT3ayRXnDmDOceZZsYYAHZbg== Sender: "kaleshsingh via sendgmr" X-Received: from kaleshsingh.c.googlers.com ([fda3:e722:ac3:10:14:4d90:c0a8:2145]) (user=kaleshsingh job=sendgmr) by 2002:ad4:4527:: with SMTP id l7mr3023885qvu.2.1601655756530; Fri, 02 Oct 2020 09:22:36 -0700 (PDT) Date: Fri, 2 Oct 2020 16:20:51 +0000 In-Reply-To: <20201002162101.665549-1-kaleshsingh@google.com> Message-Id: <20201002162101.665549-7-kaleshsingh@google.com> Mime-Version: 1.0 References: <20201002162101.665549-1-kaleshsingh@google.com> X-Mailer: git-send-email 2.28.0.806.g8561365e88-goog Subject: [PATCH v2 6/6] x86: mremap speedup - Enable HAVE_MOVE_PUD From: Kalesh Singh Cc: surenb@google.com, minchan@google.com, joelaf@google.com, lokeshgidra@google.com, kaleshsingh@google.com, kernel-team@android.com, Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , Shuah Khan , Kees Cook , "Aneesh Kumar K.V" , Peter Zijlstra , Masahiro Yamada , Arnd Bergmann , Sami Tolvanen , Frederic Weisbecker , Krzysztof Kozlowski , Hassan Naveed , Christian Brauner , Stephen Boyd , Mark Rutland , Mark Brown , Mike Rapoport , Gavin Shan , Zhenyu Ye , Anshuman Khandual , Jia He , John Hubbard , Zi Yan , Dave Hansen , Mina Almasry , "Kirill A. Shutemov" , Ram Pai , Ralph Campbell , Sandipan Das , Brian Geffon , Masami Hiramatsu , SeongJae Park , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org HAVE_MOVE_PUD enables remapping pages at the PUD level if both the source and destination addresses are PUD-aligned. With HAVE_MOVE_PUD enabled it can be inferred that there is approximately a 13x improvement in performance on x86. (See data below). ------- Test Results --------- The following results were obtained using a 5.4 kernel, by remapping a PUD-aligned, 1GB sized region to a PUD-aligned destination. The results from 10 iterations of the test are given below: Total mremap times for 1GB data on x86. All times are in nanoseconds. Control HAVE_MOVE_PUD 180394 15089 235728 14056 238931 25741 187330 13838 241742 14187 177925 14778 182758 14728 160872 14418 205813 15107 245722 13998 205721.5 15594 <-- Mean time in nanoseconds A 1GB mremap completion time drops from ~205 microseconds to ~15 microseconds on x86. (~13x speed up). Signed-off-by: Kalesh Singh --- arch/x86/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 7101ac64bb20..ff6e2755cab8 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -198,6 +198,7 @@ config X86 select HAVE_MIXED_BREAKPOINTS_REGS select HAVE_MOD_ARCH_SPECIFIC select HAVE_MOVE_PMD + select HAVE_MOVE_PUD select HAVE_NMI select HAVE_OPROFILE select HAVE_OPTPROBES